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Title: Spatial distribution of neutron flux in geological larger sample analysis at CDTN/CNEN, Brazil
Title of periodic: Journal of Radioanalytical and Nuclear Chemistry
Authors: Menezes, Maria Ângela de Barros Correia
Jaćimović, Radojko
Pereira, Claubia
Affiliation: Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, MG, Brazil
Jožef Stefan Institute Ljubljana, Slovenia
Universidade Federal de Minas Gerais, UFMG, Belo Horizonte, MG, Brasil
Issue Date: 2015
Keywords: Neutron activation analysis
Abstract: Iron monitor wire was used to evaluate the neutron flux gradients inside 5 g-geological sample during irradiation. The spatial distribution for thermal flux was about 2 %/cm for radial and axial gradients and about 5 %/cm for radial and 2.5 %/cm for axial gradients for fast neutrons. The results were evaluated using reference material IAEA-SOIL-7 analysed as small and larger samples and tested with calculating En numbers. This test pointed out that all results were consistent within a 95 % confidence interval. The contribution of the neutron flux gradients may be reduced for larger sample using the standard procedure of the k0-instrumental neutron activation analysis
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